One of the most essential characteristics of biochar (charcoal) is its higher heating value. The higher heating value for the dry ashless state of 35 samples of raw vegetable materials and charcoal was determined to establish the dependencies between the quality of the raw material and the produced biochar samples. Biochar production was carried out using modernized equipment under the patented technology. Mathematical and graphical dependencies of the experimental and calculated higher heating values for the vegetable raw materials to produce pyrolysis gas and charcoal were established. The results indicate the acceptability of the established dependencies and allow the conclusion about the possibility of predicting the higher calorific properties of plant raw materials and charcoal. The obtained data have considerable practical significance. The use of the results proposed by the authors will significantly improve the biowaste processing process in industry and increase the share of the circular economy.